StringJoiner is very useful, when you need to join Strings in a Stream. As an example, if you have to following List of Strings: final List<String> strings = Arrays.asList(“Foo”, “Bar”, “Baz”); It is much more simpler to use final String collectJoin = strings.stream().collect(Collectors.joining(“, “)); as it would be with a StringBuilder: final String collectBuilder = … Read more
I’ve been working on a little helper library for generating random strings with Python It includes a method, xeger() that allows you to create a string from a regex: >>> import rstr >>> rstr.xeger(r'[A-Z]\d[A-Z] \d[A-Z]\d’) u’M5R 2W4′ Right now, it works with most basic regular expressions.
Modifying immutable structures like strings must be done by copying the structure, and by that, consuming more memory and slowing the application’s run time (also increasing GC time, etc…). StringBuilder comes to solve this problem by using the same mutable object for manipulations. However: when concatenating a string in compile time as the following: string … Read more
When you append to the StringBuilder, the following logic happens: if (newCount > value.length) { expandCapacity(newCount); } where newCount is the number of characters needed, and value.length is the current size of the buffer. expandCapacity simply increases the size of the backing char[] The ensureCapacity() method is the public way to call expandCapacity(), and its … Read more
In your particular example, none because the compiler internally uses StringBuilders to do String concatenation. If the concatenation occurred in a loop, however, the compiler could create several StringBuilder and String objects. For example: String s= “” ; for(int i= 0 ; i < 10 ; i++ ) s+= “a” ; Each time line 3 … Read more
If you also want to remove lines that only contain whitespace, use resultString = Regex.Replace(subjectString, @”^\s+$[\r\n]*”, string.Empty, RegexOptions.Multiline); ^\s+$ will remove everything from the first blank line to the last (in a contiguous block of empty lines), including lines that only contain tabs or spaces. [\r\n]* will then remove the last CRLF (or just LF … Read more
Ok I will suppose a general use, first you have to download apache commons, there you will find an utility class named IOUtils which has a method named copy(); Now the solution is: get the input stream of your CLOB object using getAsciiStream() and pass it to the copy() method. InputStream in = clobObject.getAsciiStream(); StringWriter … Read more
If you have to write code for Internet Explorer make sure you chose an implementation, which uses array joins. Concatenating strings with the + or += operator are extremely slow on IE. This is especially true for IE6. On modern browsers += is usually just as fast as array joins. When I have to do … Read more
String is used to manipulate character strings that cannot be changed (read-only and immutable). StringBuffer is used to represent characters that can be modified. Performance wise, StringBuffer is faster when performing concatenations. This is because when you concatenate a String, you are creating a new object (internally) every time since String is immutable. You can … Read more
NOTE: This answer was written when .NET 2.0 was the current version. This may no longer apply to later versions. String.Format uses a StringBuilder internally: public static string Format(IFormatProvider provider, string format, params object[] args) { if ((format == null) || (args == null)) { throw new ArgumentNullException((format == null) ? “format” : “args”); } … Read more